Exercise bike

ABSTRACT

An exercise bike is provided, including a frame, a treading device mounted on the frame, a bike headstock device mounted on the front of the frame and a seat device mounted on the rear of the frame. The treading device includes a belt wheel, two treading rods connected with the belt wheel drive, and two pedals respectively connected to the ends of the two treading rods. The present application also includes a permanent magnet synchronous motor with wheel hub shape, a control circuit and an energy dissipation device. The permanent magnet synchronous motor is electrically connected with the energy dissipation device, the control circuit is electrically connected with the permanent magnet synchronous motor and controls the current passing through the permanent magnet synchronous motor, so as to solve the problem of the poor resistance adjustment effect of the resistance device of the existing exercise bike.

CROSS REFERENCE OF RELATED APPLICATIONS

This application is the national phase entry of International Application No. PCT/CN2019/121117, filed on Nov. 27, 2019, which is based upon and claims priority to Chinese Patent Application No. 201821972628.8 (CN), filed on Nov. 28, 2018, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present application relates to the field of fitness equipment, in particular to an exercise bike.

BACKGROUND

Exercise bike is called “Ergometric Bike” in the field of sports science. It is a typical aerobic fitness equipment simulating outdoor sports, also known as cardiorespiratory training equipment. It can improve the physique of human body. Of course, there is also the consumption of fat, and long-term fat consumption will help with weight loss.

Exercise bike is to increase the load through the resistance device. Existing resistance device is generally divided into two types, namely magnetic control resistance device and friction resistance device.

Wherein, the magnetic control resistance device is a structure in which the outer circle of the cast iron flywheel is coated with aluminum or copper sheet, and then several groups of ferrite magnets are placed in the circumferential direction of the outer circle. The aluminum or copper sheet is cutting the magnetic field generated by the ferrite magnet when the flywheel rotates, so as to generate eddy current in the sheet. And the eddy current interacts with the magnetic field to generate resistance, which is changeable by adjusting the distance between the magnet and the flywheel. Because the resistance adjustment method is mechanical, and the magnet is usually pulled by hand or motor, it has the following defects:

1. High failure rate: using pulling wire or pulling rod, the wire or rod is easy to rust, which leads to adjustment failure, and the friction between the magnet and the flywheel easily makes it fall off;

2. The accuracy of resistance adjustment is poor, and the adjustment is often not in place;

3. The response of resistance adjustment is slow, and the adjustment needs a longer reaction process;

4. The process of coating aluminum or copper sheet is complicated and the cost is high.

The friction resistance device is to directly press the brake pad on the flywheel. The brake pad is usually made of leather and wool felt material, and then with an adjustable press knob, the resistance can be changed through changes of the pressure. This method of resistance adjustment has the following defects:

1. The noise is large, and the brake pad belongs to consumables, so that the brake pads have to be replaced regularly;

2. The accuracy of resistance adjustment is poor, and it is often not in place;

3. The resistance adjustment reaction is slow, and the adjustment requires a longer reaction process.

SUMMARY

The present application aims to provide an exercise bike, the resistance control of which is realized by a permanent magnet synchronous motor, so as to solve the problem of the poor resistance adjustment effect of the resistance device in the existing exercise bike.

The specific technical solution is as follows:

An exercise bike, including a frame, a treading device mounted on the frame, a bike headstock device mounted on the front of the frame and a seat device mounted on the rear of the frame, wherein the treading device includes a belt wheel, two treading rods connected with the belt wheel through the belt wheel shaft for transmission, and two pedals respectively connected to ends of the two treading rods, and further includes a permanent magnet synchronous motor with wheel hub shape, a control circuit and an energy dissipation device; a rotating shaft of the permanent magnet synchronous motor is installed on the frame through a bearing, the belt wheel is connected with the permanent magnet synchronous motor through a drive belt, the permanent magnet synchronous motor is electrically connected with the energy dissipation device, the control circuit is electrically connected with the permanent magnet synchronous motor and controls current passing through the permanent magnet synchronous motor.

Further, the exercise bike further includes an inertia wheel, and the inertia wheel is embedded on the permanent magnet synchronous motor.

Further, the energy dissipation device is a power resistor.

Further, the exercise bike further includes a host computer, and the host computer is connected with the control circuit via signals, so as to transmit a resistance control instruction sent from the host computer to the control circuit.

Further, the host computer is a controller set on the handlebar of the bike headstock device, and the resistance is set by the controller.

Further, the host computer is an intelligent terminal, and the intelligent terminal is provided with an application program, and the resistance is set by the application program.

Compared with the prior art, the exercise bike provided by the present application has the following advantages: the resistance device of the exercise bike provided by the present application realizes resistance control by controlling the current of the permanent magnet synchronous motor, which has the characteristics of electronic adjustment, real-time and accurate controllable resistance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram of an exercise bike.

FIG. 2 is a lateral view of the exercise bike.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to further illustrate the embodiments, the present application is provided with drawings. These drawings are part of the disclosure of the present application, which are mainly used to illustrate the embodiment, and can be used to explain the operation principle of the embodiment in combination with the relevant description. With reference to these contents, ordinary skilled person in the art should be able to understand other possible embodiments and the advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

The present application is further illustrated in combination with the drawings and the specific embodiments.

As shown in FIG. 1 and FIG. 2, the present application provides an exercise bike, which includes a frame 1, a treading device 2 mounted on the frame, a bike headstock device 3 mounted on the front of the frame and a seat device 4 mounted on the rear of the frame, wherein the function of the frame 1 is to provide a stable support for the exercise bike.

The treading device 2 includes a belt wheel 20, two treading rods 22 connected to the belt wheel 20 through the belt wheel shaft 200, and two pedals 24 respectively connected to the ends of the two treading rods 22, by treading the treading pedals 24 to drive the belt wheel 20 to rotate. Further, the treading device includes a permanent magnet synchronous motor 26 with wheel hub shape, a control circuit (not shown in the drawings) and an energy dissipation device (not shown in the drawings). Here, the permanent magnet synchronous motor with wheel hub shape refers to the design of the housing of the existing permanent magnet synchronous motor into a wheel hub shape, the internal structure of which is the same as that of the existing permanent magnet synchronous motor, namely it has a stator and a rotor. The rotating shaft of the permanent magnet synchronous motor 26 is installed on the frame 1 through a bearing, and the belt wheel 20 is connected with the permanent magnet synchronous motor 26 through a drive belt 28 for transmission. That is, when the belt wheel 20 drives the permanent magnet synchronous motor 26 to rotate, the rotor of the permanent magnet synchronous motor 26 is fixed and does not rotate, and the housing of the permanent magnet synchronous motor 26 and the stator inside the housing follow the belt wheel 20 to rotate.

The permanent magnet synchronous motor 26 is electrically connected with the energy dissipation device. Because the stator winding cuts the magnetic field and generates the induced current when riding the exercise bike, the permanent magnet synchronous motor 26 is used as a generator, so the current generated during riding is consumed by the energy dissipation device. The control circuit (the control circuit is in the prior art and will not be described here for brevity) is electrically connected with the permanent magnet synchronous motor 26 and can control the current passing through the permanent magnet synchronous motor 26. When the permanent magnet synchronous motor 26 needs to increase the exercise load, the permanent magnet synchronous motor 26 will produce resistance to riding when it is powered on. By controlling the current through the permanent magnet synchronous motor 26, the electromagnetic torque of the permanent magnet synchronous motor 26 can be changed, and the resistance to riding can be adjusted, so as to adjust the increased load during riding. The electromagnetic torque control method of controlling the permanent magnet synchronous motor through the current can be realized through the field-oriented control system (FOC). That is to say, the permanent magnet synchronous motor 26, as the resistance device of the exercise bike, realizes the resistance adjustment by controlling the current. That is, through electronic adjustment, it has the advantages of being real-time, accurate and controllable.

Referring to FIG. 1 and FIG. 2, in this embodiment, an inertia wheel 260 is also included, and the inertia wheel 260 is embedded on the permanent magnet synchronous motor 26, that is, an inertia wheel 260 is embedded on the housing of the permanent magnet synchronous motor 26.

Preferably, in this embodiment, the energy dissipation device is the power resistor, that is, the current generated by the permanent magnet synchronous motor 26 is dissipated in the form of heat energy through the power resistor when riding.

Preferably, in this embodiment, it also includes a host computer, which is connected with the control circuit by signals to transmit the resistance control instruction sent from the host computer to the control circuit, and the control circuit sets the current value of the motor corresponding to the resistance (the current value is taken according to the resistance ammeter calibrated by the motor). Wherein the host computer can be the controller 50 set on the handlebar of the bike headstock device. The controller 50 can set the resistance, and the control circuit can be connected with the controller 50 through universal wired interfaces, such as UART, CAN, 485, etc., so as to receive the resistance control instruction of the controller 50. Then, according to the characteristics of electromechanical energy conversion of motor, real-time, accurate and smooth resistance output can be achieved through FOC control, and accurate power measurement can be achieved. In addition, the host computer can also be an intelligent terminal, such as a smart phone, a tablet computer, etc., and the intelligent terminal can be connected with the control circuit through wireless connection, such as WiFi, Bluetooth, etc. The intelligent terminal has a corresponding application program (APP). The application program can set resistance, then the resistance control instruction is sent to the control circuit through wireless transmission. According to the characteristics of electromechanical energy conversion of the motor, the control circuit can achieve real-time, accurate and smooth resistance output and accurate power measurement through FOC control.

Although the present application is specifically described and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present application in form and details within the spirit and scope of the present application defined by the attached claims, which are all within the protection scope of the present application. 

What is claimed is:
 1. An exercise bike, comprising a frame, a treading device mounted on the frame, a bike headstock device mounted on a front of the frame and a seat device mounted on a rear of the frame, wherein the treading device comprises a belt wheel, two treading rods connected with the belt wheel through the belt wheel shaft for transmission, and two pedals respectively connected to ends of the two treading rods, and further comprises a permanent magnet synchronous motor with wheel hub shape, a control circuit and an energy dissipation device; a rotating shaft of the permanent magnet synchronous motor is installed on the frame through a bearing, the belt wheel is connected with the permanent magnet synchronous motor through a drive belt, the permanent magnet synchronous motor is electrically connected with the energy dissipation device, the control circuit is electrically connected with the permanent magnet synchronous motor and controls current passing through the permanent magnet synchronous motor.
 2. The exercise bike according to claim 1, wherein the exercise bike further comprises an inertia wheel, and the inertia wheel is embedded on the permanent magnet synchronous motor.
 3. The exercise bike according to claim 1, wherein the energy dissipation device is a power resistor.
 4. The exercise bike according to claim 1, wherein the exercise bike further comprises a host computer, and the host computer is connected with the control circuit signal via signals, so as to transmit a resistance control instruction sent from the host computer to the control circuit.
 5. The exercise bike according to claim 4, wherein the host computer is a controller set on the handlebar of the bike headstock device, and the resistance is set by the controller.
 6. The exercise bike according to claim 4, wherein the host computer is an intelligent terminal, and the intelligent terminal is provided with an application program, and the resistance is set by the application program. 